COR 20 and Flow Meter Question

[Roosterjack]

Neptune recommends a 1 1/4 inch plumbing for the output in order to see the best performance. I do not, however, see a flow monitor for Apex in this size. Are there others that can be used? What is the best approach?

 

[SuncrestReef]

They recommend using the 2" flow meter with adapters to fit it to the 1.25" plumbing. If you use the 1" flow meter with adapters, that would restrict the flow.